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Intangible Assets - Summary of Intangible Assets (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment losses | kr (15,333) | kr (31,916) | kr (61)
Capitalized development expenditure [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 4,678 |  |
Intangible assets and goodwill, Closing balance | 4,593 | 4,678 |
Capitalized development expenditure [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 22,983 | 21,096 |
Additions | 1,300 | 2,173 |
Disposals |  | (153) |
Reclassifications | 20 | (16) |
Translation differences | 268 | (117) |
Intangible assets and goodwill, Closing balance | 24,571 | 22,983 | 21,096
Capitalized development expenditure [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (14,560) | (13,646) |
Amortizations | (1,480) | (1,137) |
Disposals |  | 153 |
Translation differences | (193) | 70 |
Intangible assets and goodwill, Closing balance | (16,233) | (14,560) | (13,646)
Capitalized development expenditure [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (3,745) | (3,745) |
Intangible assets and goodwill, Closing balance | (3,745) | (3,745) | (3,745)
Goodwill [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 52,944 |  |
Intangible assets and goodwill, Closing balance | 56,077 | 52,944 |
Goodwill [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 91,185 | 90,914 |
Balances regarding acquired/divested business | (375) | 348 |
Translation differences | 4,392 | (77) |
Intangible assets and goodwill, Closing balance | 95,202 | 91,185 | 90,914
Goodwill [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (38,241) | (6,344) |
Balances regarding acquired/divested business | 375 |  |
Impairment losses | (1,260) | (31,897) |
Translation differences | 1 |  |
Intangible assets and goodwill, Closing balance | (39,125) | (38,241) | (6,344)
Customer relationships, IPR, and other intangible-assets [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 22,667 |  |
Intangible assets and goodwill, Closing balance | 7,954 | 22,667 |
Customer relationships, IPR, and other intangible-assets [member] | Cost [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | 80,810 | 82,854 |
Additions | 376 | 97 |
Balances regarding acquired/divested business | (249) | 306 |
Disposals | (314) | (563) |
Translation differences | 4,437 | (1,884) |
Intangible assets and goodwill, Closing balance | 85,060 | 80,810 | 82,854
Customer relationships, IPR, and other intangible-assets [member] | Accumulated depreciation and amortization [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (50,405) | (48,770) |
Amortizations | (2,500) | (3,321) |
Balances regarding acquired/divested business | 184 |  |
Disposals | 314 | 563 |
Translation differences | (2,281) | 1,123 |
Intangible assets and goodwill, Closing balance | (54,688) | (50,405) | (48,770)
Customer relationships, IPR, and other intangible-assets [member] | Accumulated impairment losses [member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets and goodwill, Opening balance | (7,738) | (7,744) |
Balances regarding acquired/divested business | 65 |  |
Impairment losses | (14,073) | (19) |
Translation differences | (672) | 25 |
Intangible assets and goodwill, Closing balance | kr (22,418) | kr (7,738) | kr (7,744)

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